As you can see in the 1º image, i put the orange marks for you can see there is white space, the page doesnt expand as in the second one. How i can expand image to that white space too.
It seems like you’re using a fixed width for the page in the first image.
To make the page full-width, uncheck the field “Make this element fixed width” in the property window of the page.
Be mindful to select the page and not an element on the page, to do this click outside any element (e…g in any of the orange areas you show in your first image.
To be sure you’re selecting the page, check to see if the property window’s name is the same as the name of the page you’re working on.